Meth is a strong stimulant often used recreationally
as a party drug. Among the effects reported by meth
users is an increase in the need and urgency for sex,
the ability to have sex for extended periods, and an
inability to ejaculate or reach orgasm or physical
release. In addition to increasing the need for sex and
enabling the user to engage in marathon sex sessions,
meth lowers inhibitions and causes users to behave
recklessly or to become forgetful.

According to a San Diego study,
meth
users often engage in unsafe sexual activities, and
forget or choose not to use condoms. The study found
that meth users were six times less likely to use
condoms.

The urgency for sex combined with the inability to
achieve release can result in tearing, chafing and
trauma (such as rawness and friction sores) to the sex
organs and the rectum and mouth, dramatically increasing
the risk of transmission of HIV and other sexually
transmitted diseases.

Meth also causes erectile dysfunction (sometimes
called crystal dick) which often leads people to decide
to engage in receptive anal sex or fisting.